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Paper Abstract and Keywords
Presentation 2009-10-23 11:00
Performance of Cooperative HARQ with Relay Selection that Exploits Inter-relay Opportunistic Listening
Nandar Lynn (Keio Univ.), Osamu Takyu (Tokyo Univ. of Science), Koichi Adachi, Masao Nakagawa (Keio Univ.) SR2009-63 AN2009-33 USN2009-36
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we present a practically feasible cooperative HARQ with relay selection that exploits inter-relay transmissions. We first introduced this scheme in our previous report [8]. In [8], we derived theoretical expressions for error-rate performance of the system and analytical results were verified by the simulated results. In this report, we provide further results from [8]; such as performance comparisons with the existing related schemes and performance with different relay positions. In the system under consideration, the source node is located beyond the coverage of the destination node. The relay nodes assist to establish a communication link between the source and the destination. Therefore, the end-to-end transmission channel has two independent parts: source-relay and relay-destination channel. Among the relays that receive the signal from the source correctly, the one whose relay-destination channel has the largest channel gain transmits to the destination. We employ a low overhead distributed relay selection technique. Exploiting the broadcast nature of the wireless channel, the relays with errors can opportunistically listen (OL) to the transmitted signal from a relay without error to combine with their erroneous received signals. Consequently, these relay nodes originally with erroneous received signals may be able to decode the signals successfully due to the obtained spatial diversity. This results in the increase in degree of freedom in relay selection for retransmission by ARQ in relay-destination channel. Thus the relay node selected for retransmission may be different from that selected for initial relay transmission, achieving spatial diversity gain.
Keyword (in Japanese) (See Japanese page) 
(in English) cooperative HARQ / opportunistic listening / spatial diversity / relay selection / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 246, SR2009-63, pp. 79-85, Oct. 2009.
Paper # SR2009-63 
Date of Issue 2009-10-15 (SR, AN, USN) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Download PDF SR2009-63 AN2009-33 USN2009-36

Conference Information
Committee SR AN USN  
Conference Date 2009-10-22 - 2009-10-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless distributed network, etc. 
Paper Information
Registration To SR 
Conference Code 2009-10-SR-AN-USN 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance of Cooperative HARQ with Relay Selection that Exploits Inter-relay Opportunistic Listening 
Sub Title (in English)  
Keyword(1) cooperative HARQ  
Keyword(2) opportunistic listening  
Keyword(3) spatial diversity  
Keyword(4) relay selection  
1st Author's Name Nandar Lynn  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Osamu Takyu  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Koichi Adachi  
3rd Author's Affiliation Keio University (Keio Univ.)
4th Author's Name Masao Nakagawa  
4th Author's Affiliation Keio University (Keio Univ.)
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Date Time 2009-10-23 11:00:00 
Presentation Time 20 
Registration for SR 
Paper # IEICE-SR2009-63,IEICE-AN2009-33,IEICE-USN2009-36 
Volume (vol) IEICE-109 
Number (no) no.246(SR), no.247(AN), no.248(USN) 
Page pp.79-85(SR), pp.71-77(AN), pp.53-59(USN) 
#Pages IEICE-7 
Date of Issue IEICE-SR-2009-10-15,IEICE-AN-2009-10-15,IEICE-USN-2009-10-15 

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